Link: http://blog.testfreaks.com/review/review-of-supertooth-crystal-bluetooth-speakerphone/
Quote: “The SuperTooth Crystal is a versatile Bluetooth car speakerphone as it can play back music from Bluetooth A2DP enabled phones, announce GPS instructions as well as function as a hands free system. This last feature is great for those with stringent hands free driving laws. The Crystal is simple to install and pair up. Plus it works flawlessly with the iPhone 4S and Siri. ”